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4 (* ||A|| A project by Andrea Asperti *)
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7 (* ||T|| The HELM team. *)
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15 include "ground/relocation/gr_tl.ma".
16 include "ground/relocation/gr_isi.ma".
18 (* IDENTITY CONDITION FOR GENERIC RELOCATION MAPS ***************************)
20 (* Constructions with gr_tl *************************************************)
23 lemma gr_isi_tl (f): 𝐈❪f❫ → 𝐈❪⫱f❫.
24 #f cases (gr_map_split_tl f) * #H
25 [ /2 width=3 by gr_isi_inv_push/
26 | elim (gr_isi_inv_next … H) -H //